Google launched AdSense for mobile 7 months later than Yahoo! its mobile display ad system for its Mobile Web service. When Yahoo! started with 19 countries Google replied with six fewer, they are offering AdSense for Mobile in 13 countries: US, England, France, Italy, Germany, Spain, Ireland, Russia, Netherlands, Australia, India, China, and Japan (available in the coming weeks).

It was just a matter of time when AdSense was developed for mobiles. Since there are about 6.6 billion people in the world and about half that many mobile phone subscriptions and there are currently more mobile devices worldwide than personal computers and televisions combined so it could be a promised land for Google. But the best part is that ad blocking on mobile handsets isn’t an issue. No worries it will be pretty soon.

Google’s ability to profit from mobile advertising will depend largely on how much it knows about those viewing its mobile ads and the extent to which it can convert that knowledge into ad targeting data. While telecom companies typically know a great deal about their subscribers, they tend not to share that information without compensation, if at all. That leaves Google to either make deals with telecom partners or to deepen its own data about those using its services both on the Internet and mobile devices.

We will see how it goes, meanwhile you can keep an eye on AdSence blog.